USB C Tester Power Meter User Manual

1. Introduction

The YEREADW USB C Tester Power Meter is a versatile and essential tool for anyone working with USB-C devices. This compact and intelligent device allows you to accurately monitor and test various electrical parameters, including voltage, current, power, capacity, energy, temperature, and working time. It supports a wide range of fast charging protocols, making it ideal for diagnosing and optimizing the charging performance of smartphones, tablets, laptops, power banks, and other USB-C compatible electronics.

Designed for both digital enthusiasts and professionals, this tester provides real-time data on its clear LED color display, helping you ensure safe and efficient power delivery to your devices.

2. What's in the Box

• USB C Tester
• User Manual
• Storage Case

3. Setup and Connection

To begin using your USB C Tester, follow these simple connection steps:

1. Connect the USB-C male end of the tester to the power source (e.g., wall charger, power bank, laptop USB-C port).
2. Connect your device (e.g., smartphone, tablet) to the USB-C female port on the tester using a compatible USB-C cable.
3. Once both input and output ports are connected, the tester's LED display will light up and begin showing real-time measurement data.

Important Note on PD Protocol Limitations: Due to Power Delivery (PD) protocol requirements, the USB-C tester's screen will only activate and display data if both the input (power source) and output (device being charged) ports are properly connected. If only one side is connected, the screen will remain off.

4. Operating Instructions

4.1. LED Color Display Interface

The USB C Power Meter features a high-resolution LED color display that provides clear and comprehensive data. It can display various parameters simultaneously, including:

• Voltage (V)
• Current (A)
• Power (W)
• Capacity (mAh)
• Energy (mWh)
• Working Time (T)
• Current Direction
• CPU Temperature
• D+/D- Voltage

4.2. Button Functions

The device operates with a single multi-function button:

• Single Click: Click the button once to cycle through the different display screens.
• Double Click: Double-click the button to rotate the displayed content on the current screen, allowing for better viewing angles.
• Press and Hold (3 seconds): Press and hold the button for approximately 3 seconds to clear all accumulated capacity, energy, and timing data. This is useful for starting new measurement cycles.

4.3. Bidirectional Current Test

The USB C Tester supports bidirectional current testing, which simplifies the process of analyzing charging data regardless of the current flow direction. This feature is particularly useful when testing devices that can both receive and supply power.

4.4. Testing Power Bank Capacity

To accurately measure the capacity of a power bank using the tester, follow these steps:

1. Ensure the power bank is fully discharged before starting the test.
2. Plug the USB tester into the power bank's output port.
3. Long press the button (3 seconds) on the tester to reset all capacity and energy data.
4. Connect the power bank to a USB charger via the tester's input port.
5. Keep the power bank charging until it reaches 100% capacity.
6. Read the accumulated capacity data (mAh) displayed on the tester after the full charge cycle is complete.

Formula for Power Bank Battery Capacity (mAh):
Capacity (mAh) = Wh / 3.75V x 1000 x 90%
(Note: 3.75V is the default battery voltage for calculation.)

5. Key Features and Capabilities

• Improved Measurement Accuracy: The tester provides high accuracy of ± (1%+5), ensuring precise data for detecting charging devices such as chargers, mobile phones, tablets, and power banks.
• Wide Applicability: With a measuring current range of 0-6.5A and voltage range of 4V-30V, this USB meter is suitable for a broad array of 3C digital peripheral products.
• Detects Various Fast Charging Protocols: Supports PD2.0/3.0, QC2.0/3.0, FCP, SCP, AFC, PE, DASH VOOC, and Super VOOC protocols, making it compatible with most modern fast charging standards.
• Universal Compatibility: Compatible with a wide range of USB-C devices including Samsung/Google/Android phones, iPhone 15 series, iPads, MacBooks, Nintendo Switch, Bluetooth earbuds, wall chargers, power banks, and car chargers.

• Intelligent Chip for Safe Charging: Equipped with a built-in high-precision chip, the tester ensures accurate measurement of electricity data and contributes to safe charging by monitoring parameters in real-time.

6. Maintenance

To ensure the longevity and optimal performance of your USB C Tester, follow these maintenance guidelines:

• Cleaning: Use a soft, dry cloth to clean the device. Avoid using liquid cleaners or abrasive materials, as they may damage the screen or internal components.
• Storage: Store the tester in its provided storage case when not in use to protect it from dust, moisture, and physical damage. Keep it in a cool, dry place away from direct sunlight.
• Handling: Handle the device with care. Avoid dropping it or subjecting it to strong impacts.
• Connectivity: Ensure the USB-C connectors are free from debris before plugging them in. The antioxidant input port is designed for durability, but proper care extends its lifespan.

7. Troubleshooting

• Screen Does Not Light Up:
  Solution: Ensure that both the input (power source) and output (device being charged) ports are connected. The tester's screen will only activate when both sides are properly engaged due to PD protocol limitations. Refer to Section 3 for correct connection methods.
• Inaccurate Readings or No Reading for Low Power Devices:
  Observation: The tester may not display readings for very low current consumption (e.g., below 1mA), and the timer/mAh accumulation might not function in such scenarios.
  Explanation: This device is designed for a range of 0-6.5A. While it measures down to low currents, its practical resolution for extremely low power devices (e.g., micro-amps for deep sleep cycles) may be limited. For such precise low-power measurements, specialized equipment like a multimeter might be more suitable.
• Display Content Not Rotating:
  Solution: Double-click the button to rotate the displayed content. A single click cycles through different screens.
• Data Not Clearing:
  Solution: Press and hold the button for approximately 3 seconds to clear all accumulated capacity, energy, and timing data. Ensure you hold it long enough for the reset to occur.

8. Specifications

9. Warranty and Support

YEREADW is committed to providing high-quality products and excellent customer service. Your USB C Tester comes with the following:

• 18-Month Warranty: Enjoy peace of mind with an extended warranty covering manufacturing defects.
• 30-Day No Reason Return: If you are not satisfied with your purchase, you may return it within 30 days for a full refund.
• 24 Hours Customer Support: Our dedicated customer support team is available to assist you with any questions or issues you may encounter.

For further assistance, please refer to the contact information provided in your product packaging or visit the official YEREADW store online.